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(No Model.)

H. M. BYLLESBY.

SYNGEEUNIZING DEVICE EOE. ALTERNATE GUEEENT DYNAMOS.

No. 888,618. Patented Mey 29, 1888.

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UNITED STATES PATENT OEEIcE.v y

HENRY M. BYLLESBY, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO THE WESTINGHOUSE ELECTRlO COMPANY, OF SAME PLACE.

SYNCHRONIZING DEVICE FOR ALTERNATE-CURRENT DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 383,618, dated May 29, 1888.

Application tiled September i, 1837. Serial No. 249,475. (No model.)

To all wwm 'it may concern:

Be it known that I, HENRY M. BYLLEsBY, acitizen of the United States, residing in Pittsburg, in the county of Allegheny, in the State of Pennsylvania, have invented certain new and useful Improvements in Synchronizing Devices for Electric Machines, of which the following is a specification.

The invention relates to a method of constructing and organizing electric generators for the purpose of obtaining synchronism in their movements.

The invention consists, generally, in coupling the belt-wheels of alternate-current electric generators with the armature shafts through yielding connections which will allow a slight movement of the wheels with reference to the armatures, so that any force which may tend to accelerate one of two or more machines delivering currents to the same circuit will be expended in or absorbed by the yielding connections, and will not result in throwing the machine out of synchronism.

The invention will be described more specifically in connection with the accompanying drawings, in which- Figure 1 is a plan view of an organization of apparatus adapted to carry out the invention, and Fig. 2 is a detail of one of the pulleys.

Referring to the figures, A represents an alternate-current generator, and A2 a second generator similar thereto. These are designed to be driven by the same or by different engines. In this instance two engines, B and B2, are shown.` These are respectively provided with shafts b and b2, which carry belt-wheels 1r41 and bt, These belt-'wheels are connected by belts C and C2 with the pulleys D' and D2 of the generators A and A2. coupled with the shafts a and c? ofthe generators through yielding springs, in a manner presently to be described. The springs are designed to allow a slight forward or backward movement of the corresponding pulley with reference to its armature, as occasion may require.

The pulley D is shown in horizontal section, and likewise the pulley D2, although the latter is in a position ninety degrees in advance of the other, for the purpose of showing the construction. Each pulley is constructed with The pulleys are a collar, @,which surrounds the corresponding shaft, and this is capable of movement independently ofthe shaft. Itis, however, coupled with the shaft by means of lugs e, e2, e3, and e* secured to the fiange or web f. These lugs extend parallel with the armature -shaft between the arms h 7L and h2 h2 and h3 if and h4 h", which are rigidly secured to the shaft by means of corresponding collars, H and H2. A space is left between the respective arms applied to each lug e', e2, e3, or e4, and preferably a rod, k, extends from one arm to the other and loosely through the corresponding lugs c', e2, e, or et. Upon each side of this arm and upon the rod le there is a corresponding coil-spring, as shown at n u2. These normally hold the lugs e', c2, e, and e in positions midway between the corresponding arms h h', if h2, die., and thus the pulley-wheel is held in a given position relative to the armature, but it is capable of a slight movement against the force of the springs in either direction. There are shown, it will be understood, four sets of springs as applied to each belt-pulley; but this number may be varied as found convenient, and also the general construction may be variously modied.

It is well known that when alternate-current generators delivering approximately the same number of impulses per minute are connected in multiple arc to deliver currents in the same direction to awork-circuit, LLZ, for instance, they tend to fall into synchronisrn; but it is found in practice that there are liable to be 85 slight fluctuations in the current thatis delivered by two or more generators so connected, by reason of an occasional tendency of one machine to momentarily drive ahead or fall behind the other. This may be due to various causessuch, for instance, as a slippage of the belt, or, in the case of two different drivingengines vbeing employed, an acceleration of speed on the part of one machine above that ofthe other. It will be understood that any such tendency will be overcome by the present invention, for the natural tendency of the two machines to keep together is very strong, and it will require a very considerable force to throw them out of unison, and t-he normal fluctuations in the driving-power and in the power required to drive the generators will be IOO absorbed by the springs or dynamometer-pulleys, so that the twowill not be thrown out of synchronism.

In the drawings there is shown in connection with the work-circuit L and L? a converter, C. The primary coil p is connected in the circuit L L2, and the secondary circuit s includes translating devices d d in multiple arc. Other converters may be connected in multiple arc or otherwise with the converter C.

I claim as my invention- 1. The combination,with an electric circuit andtwo or morealternate-current electric generators delivering currents to said circuit, of a source of power for driving the same, and

' yielding connections between the source of power and said machines, respectively, substantially as described.

2..'Ihe combination, with two or more al- 20 ternate-current electric generators and a cirleys at an approximately constant speed, sub-v stantially .as described. t

In testimony whereof I have hereunto subscribed my name this lstday of July, A. D.

HENRY M. BYLLESBY. Witnesses:

W. D. UPTEGRAFF, CHARLES A. TERRY. 

